CN116827312A - Intermittent auxiliary source power supply device with high isolation voltage resistance and high interference resistance - Google Patents

Intermittent auxiliary source power supply device with high isolation voltage resistance and high interference resistance Download PDF

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Publication number
CN116827312A
CN116827312A CN202310656614.4A CN202310656614A CN116827312A CN 116827312 A CN116827312 A CN 116827312A CN 202310656614 A CN202310656614 A CN 202310656614A CN 116827312 A CN116827312 A CN 116827312A
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power supply
voltage
auxiliary source
isolation
marx
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邹才勇
金珊珊
方志
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Nanjing Tech University
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Nanjing Tech University
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits
    • H03K3/02—Generators characterised by the type of circuit or by the means used for producing pulses
    • H03K3/53—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback
    • H03K3/57—Generators characterised by the type of circuit or by the means used for producing pulses by the use of an energy-accumulating element discharged through the load by a switching device controlled by an external signal and not incorporating positive feedback the switching device being a semiconductor device
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/14—Arrangements for reducing ripples from dc input or output

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Generation Of Surge Voltage And Current (AREA)

Abstract

The invention provides an intermittent auxiliary source power supply device with high isolation voltage resistance and high interference resistance, which comprises a plurality of Marx power modules, wherein each power module is composed of a multi-stage Marx circuit, each stage Marx circuit comprises a MOSFET, a commercial DC-DC auxiliary source DC power supply module supplies power for a MOSFET driving circuit, and the Marx power modules are isolated by an ultrafast recovery isolation diode. The invention solves the problem of auxiliary source isolation withstand voltage of the high-voltage all-solid-state Marx nanosecond pulse power supply. The interference ripple wave of the auxiliary source circuit in the pulse discharging period is effectively reduced, the influence of pulse interference on the Marx circuit is reduced, and the output waveform is more stable. The problems of high-floating potential isolation withstand voltage of the auxiliary source and output waveform distortion caused by conduction interference of the pulse power supply to the auxiliary source power supply circuit during discharging and the like in the conventional solid Marx high-voltage nanosecond pulse power supply are effectively solved.

Description

Intermittent auxiliary source power supply device with high isolation voltage resistance and high interference resistance
Technical Field
The invention relates to the technical field of pulse power, in particular to an intermittent auxiliary source power supply device with high isolation voltage resistance and high disturbance resistance.
Background
Among pulsed power techniques, high voltage isolation techniques are critical. The high voltage pulse power system is generally composed of a high voltage pulse source, a high voltage isolation circuit design, an electronic device control system and the like. The high-voltage isolation circuit is designed as a key technology in the system, and can realize isolation between high voltage and low voltage and ensure the stability of control signals of a control system of an electronic device. The application of high voltage isolation techniques can significantly improve the efficiency and reliability of the pulsed power system. With the continuous development of power electronics and the continuous expansion of application fields, high-voltage isolation technology is also increasingly important in pulse power technology.
The nanosecond pulse power supply is used as an important application in the technical field of pulse power, and has important application value in the fields of material science, biomedicine, electronics and the like. The high-voltage nanosecond pulse power supply based on the all-solid-state Marx circuit is taken as a typical nanosecond pulse power supply, all levels of semiconductor switches respectively work at different high-floating potentials during the generation of high-voltage pulses, and the existing Marx circuit needs to be cascaded with more levels of Marx circuits in order to realize high-voltage output, so that the problem of electrical isolation between an auxiliary source circuit at a higher-level floating potential and the ground potential is directly caused to become a key factor for limiting the solid-state Marx nanosecond pulse power supply.
To solve the problem of high floating potential auxiliary source isolation, there are generally two methods: one is to use commercial isolation DC-DC converter, but commercial isolation DC-DC converter isolation voltage is limited, and can only reach 10kV at most, and can not meet the auxiliary source isolation power supply problem of nanosecond pulse power supply with higher voltage level; another approach is to use an isolation transformer, but the approach is more suitable for pulse power systems that are relatively large and of higher voltage class.
Patent CN 106655141A is a method for isolating high-voltage protection circuit of 485 chip, which is suitable for isolating high-voltage protection of 485 communication bus chip and is not suitable for isolating auxiliary source with high floating potential.
Patent CN 202837370U and patent CN 108896846A are a circuit with functions of electrically isolating and suppressing electromagnetic interference, and a device and a method for measuring high-voltage system conduction interference, and both the two methods have complex structures, which are unfavorable for the design of a power board based on a Marx circuit with smaller volume.
Disclosure of Invention
1. The technical problems to be solved are as follows:
because the existing Marx circuit needs to be cascaded with more stages in order to realize high-voltage output, the problem of electrical isolation between an auxiliary source circuit at a higher-level floating potential and a ground potential is directly caused, and the solid Marx nanosecond pulse power supply is limited.
2. The technical scheme is as follows:
in order to solve the problems, the invention provides an intermittent auxiliary source power supply device with high isolation voltage resistance and high disturbance resistance, which comprises a plurality of Marx power modules, wherein each power module consists of a multi-stage Marx circuit, each stage Marx circuit comprises a MOSFET, a commercial DC-DC auxiliary source direct current power supply module supplies power for a MOSFET driving circuit, and the Marx power modules are isolated by an ultrafast recovery isolation diode.
The commercial isolation DC-DC module is a Jin Sheng positive power module with isolation voltage of 3kV.
The driving chip of the MOSFET is IXDN609PI manufactured by IXYS corporation.
The input side of the commercial isolation DC-DC module is connected with a pi-type LC low-pass filter, and the pi-type filter circuit is formed by connecting two capacitors in parallel and connecting an inductor in series.
The working process of Marx circuit charging is as follows: the direct-current charging power supply charges the energy storage capacitor through the diode until the voltage of the energy storage capacitor is equal to the output voltage of the high-voltage direct-current power supply, meanwhile, the direct-current power supply supplies power to the signal receiving circuit and the driving circuit in each stage of Marx circuit unit through the power supply module, and is connected with the energy storage capacitor at the left side of the power supply module in parallel to store energy when the Marx circuit is charged.
The working process of the Marx circuit during discharging is as follows: when the parallel charging of the energy storage capacitors is completed, the discharge switches of each stage are controlled to be turned on, each stage of the charge switch is in an off state, the diode is turned off due to reverse bias, and the discharge switches connect the energy storage capacitors of each stage in seriesDischarging the load, and obtaining a positive pulse of direct current charging voltage on the load; the ultrafast recovery diode is reversely cut off, and the commercial isolation DC-DC power supply module is no longer powered by V CC Power supply, the capacitor connected in parallel is used for temporarily supplying energy to enable V CC_n Is suspended at V CC_n-1 (n is not less than 2).
3. The beneficial effects are that:
the invention provides an intermittent auxiliary source power supply device with high isolation voltage resistance and high anti-interference performance, which not only can solve the auxiliary source isolation voltage resistance problem of a high-voltage all-solid-state Marx nanosecond pulse power supply by adopting a mode of combining a commercial DC-DC converter with an ultrafast recovery isolation diode. In addition, the interference ripple wave of the auxiliary source circuit during the pulse discharge period can be effectively reduced, the influence of pulse interference on the Marx circuit is reduced, and the output waveform is more stable.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Fig. 2 is a schematic diagram of a charging process.
Fig. 3 is a schematic diagram of a discharge process.
FIG. 4 is a schematic diagram of an intermittent auxiliary source power circuit isolation withstand voltage model.
Fig. 5 is a circuit diagram of a pi-type LC low pass filter.
Fig. 6 is a schematic diagram of the operation of a pi-LC low pass filter under high frequency positive pulse interference.
Fig. 7 is a schematic diagram of pi-LC low pass filter operation without impulse interference.
Fig. 8 is a comparison of the dc supply waveforms with or without the filter under no-load conditions.
Fig. 9 is a comparison graph of the dc supply waveforms with or without the filter under loaded conditions.
Fig. 10 is a full power output waveform under a 1kΩ resistive load.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
During the high-voltage pulse generation period, the high-voltage pulse power supply based on the solid-state Marx circuit respectively works at different high-suspension potentials at each stage of semiconductor switch, and each submodule is effectively controlledThe on and off of the semiconductor switch under the high-potential suspension working condition becomes a great challenge for the development of the pulse power supply. The potential diagram of the all-solid-state Marx power circuit during discharge is shown in FIG. 1, from which we can see the discharge switch tube Q d1 The source potential of (2) is U; q (Q) d2 Is 2U; q (Q) d3 Is 3U; and so on Q dn Is nU. The discharge switch tube MOSFET of each stage is at different potential, during discharge, the ground of the input end of the power Marx circuit is short-circuited with the ground of the discharge loop, and the isolation voltage required by the auxiliary source is nU dc Therefore, the auxiliary source for supplying power to the driving circuit should have higher isolation voltage capability, and the more the Marx stage number is, the stronger the isolation capability is required, and the higher the requirement for isolating the power supply module is.
Along with the increase of the amplitude of the output pulse voltage, the high-voltage insulation problem of the high-floating potential auxiliary source power supply circuit and the low-voltage control end of each switch driving circuit becomes an important factor for limiting the solid-state high-voltage pulse power supply. In practical applications of high-voltage pulse power sources, the auxiliary source isolation power supply method working at a relatively high potential position generally comprises the following two methods: one is to use a commercially available isolated DC-DC converter that is suitable for relatively compact and gentle high voltage systems, but has a limited magnitude of isolation withstand voltage that cannot be used in high voltage pulse systems. Another approach, which is more suitable for relatively large and higher voltage class pulsed power systems, uses an isolation transformer for isolation between the ground side and the high potential. Although both of these methods are widely used in various pulse power supply circuits, limitations caused by electrical insulation requirements cannot be avoided.
In order to meet the requirement of the designed Marx power circuit on high isolation voltage for auxiliary source power supply, the invention designs an intermittent auxiliary source power supply circuit with high isolation voltage withstand capability by combining an isolation DC-DC and an ultrafast recovery diode, and as shown in figure 1, the power circuit is composed of n stages of Marx circuits with the same level, so that the change of the circuit stage number is very convenient. VD in circuit 1 ～VD n For a short timeRecovering the isolation diode; q (Q) d1 ～Q dn 、Q c1 ～Q cn Is a semiconductor switch, wherein Q d1 ～Q dn Is a main switch for discharging the circuit; q (Q) c1 ～Q cn Is a charging switch; c (C) 1 ～C n The energy storage main capacitor is used for the circuit; r is R L Is a load resistance; d (D) 1 ～D n-1 U for recovering high-voltage isolation diode 1 ～U 4n The power module is used for isolating commercial DC-DC auxiliary source direct current power supply with the voltage of 3kV. For example, U 1 ～U n The MOSFET in the Marx power module 1 is supplied with direct current module, and U is used for supplying power to the module 1 Is a switching tube Q c1 Is powered by a driving circuit of (1), U 2 Is a switching tube Q d1 And Q is equal to c2 Is powered by a driving circuit of (1), U 3 Is a switching tube Q d2 And Q is equal to c3 Is powered by a driving circuit of (1), U 4 Is a switching tube Q d3 The Marx power modules are isolated by an ultrafast recovery isolation diode.
According to the invention, the ultra-fast recovery high-voltage isolation diode is added between the stages of the Marx circuit for isolation, and the insulation voltage resistance of the auxiliary source power supply circuit at the high suspension potential is improved in a diode accumulation mode.
In one embodiment, the system comprises 3 stages of Marx circuits, each stage of Marx circuit comprises an energy storage capacitor, an isolation diode, a MOSFET (metal oxide semiconductor field effect transistor) switch tube, a driving circuit and an auxiliary source power supply system, the 3 stages of Marx circuits form a Marx power module, each Marx power module is powered by 4 isolated DC-DC (direct current-direct current) circuits respectively for the MOSFET driving circuits in the module, and a power supply is V cc The isolation DC-DC module selects Jin Sheng positive power supply module with isolation voltage of 3kV, and the driving chip of the MOSFET selects IXDN609PI produced by IXYS company.
The invention adopts a mode of combining a commercial isolation direct current power supply module and an ultrafast recovery isolation diode on a power Marx board, and has reliable system stability and high integration degree through proper circuit design.
The invention can effectively solve the problem of high-suspension potential isolation and voltage resistance of the auxiliary source of the solid-state Marx high-voltage nanosecond pulse power supply and the problem of output pulse waveform distortion caused by the interference of the pulse power supply to the auxiliary source power supply circuit during discharging, provides a new solution for the problem of high-voltage isolation of the solid-state Marx nanosecond pulse power supply, and has important engineering application significance.
As shown in fig. 2, the device is shown in a non-operating state with a light color. When the Marx circuit is charged, each stage of discharging switch Q d1 ～Q dn In the off state, charge switches Q at each stage c1 ～Q cn In an on state, the direct current charging power supply passes through the diode VD 1 ～VD n To the energy storage capacitor C 1 ～C n Charging until the voltage of the energy storage capacitor is equal to the output voltage of the high-voltage direct-current power supply, namely U C1 ＝U C2 ＝U C3 ＝…＝U Cn ＝U dc At the same time, DC power supply V CC Through U 1 ～U 4n The power supply module supplies power to auxiliary circuits such as a signal receiving circuit, a driving circuit and the like in each stage of Marx circuit unit and is connected in parallel with the U 1 ～U 4n The energy storage capacitor at the left side of the power supply module stores energy when the Marx circuit is charged.
As shown in FIG. 3, when the parallel charging of the energy storage capacitor is completed, the discharge switches Q of each stage are controlled d1 ～Q dn Turn on, light color indicates the charge switch Q at each stage c1 ～Q cn In the off state, diode VD 1 ～VD n The discharge switch connects the energy storage capacitors of each stage in series to the load R due to the cut-off of reverse bias L Discharging at load R L Obtaining nU from dc Positive pulse of (U) out t＝nU dc The method comprises the steps of carrying out a first treatment on the surface of the For auxiliary source circuits, ultrafast recovery diode D 1 ～D n-1 Reverse cut-off, isolation DC-DC power module U i (i=5 to 4 n) is no longer defined by V CC Power is supplied, and in turn, temporarily supplied by a capacitor connected in parallel to the left thereof, through a diode D 1 ～D n-1 Isolation of V CC_n Is suspended at V CC_n-1 (n is not less than 2).
The high-voltage nanosecond pulse power supply has the working characteristic of high-isolation withstand voltage-intermittent auxiliary source power supply. For auxiliary source power supply circuit, an isolation diode is adopted to combine with the isolation DC-DCBy adopting the combined mode, high isolation withstand voltage is realized. The intermittent auxiliary source power supply circuit isolation withstand voltage model is shown in figure 4, in which F 1 ～F i Respectively supplying power to the auxiliary source module systems, V CC_1 ～V CC_i Respectively module F 1 ～F i Direct current input of F 1 Providing DC power to auxiliary source of ith Marx power module, module F i The output 15V of (a) is used for supplying power to a signal receiving circuit and a driving circuit in the module, and the module F i The isolation voltage of the direct current DC-DC converter used in the method is 3kV, D 1 ～D n-1 The ultra-fast recovery isolation diode is resistant to 5 kV.
As can be seen from fig. 4, the ultrafast recovery isolation diode D i Reverse withstand voltage of 5kV, i.e. module F i And module F i-1 The isolation withstand voltage between the two is 5kV, the isolation voltage of the direct current DC-DC converter in each module is 3kV, namely the isolation voltage between the input side and the output of the DC-DC converter is 3kV, and taking the module 1 as an example, V CC_1 The isolation voltage with gnd_3 is 3kV, and the isolation voltage between gnd_3 and GND is also 3kV. The Marx power circuit powered by the auxiliary source provided by the ith module shares a 3 i-level Marx circuit, and when the high-voltage direct-current input voltage is 1000V at the maximum value, the theoretical output pulse voltage amplitude of the nanosecond power supply is 3000i V, so that the isolation voltage between the ith module and GND needs to reach 3000i V in the pulse discharging stage. As can be seen from the intermittent auxiliary source power supply circuit isolation withstand voltage model shown in FIGS. 3-5, the theoretical isolation voltage between the ith module and GND in the pulse discharge stage is (5000 i-2000) V because of (5000 i-2000)>3000i (where i=1, 2,3, …, n), the high isolation withstand voltage-intermittent auxiliary source power system designed herein meets the isolation withstand voltage requirement of a Marx circuit-based nanosecond pulse power supply to an auxiliary source system.
Electromagnetic interference (EMI) is an electronic noise that interferes with cable signals and reduces signal integrity, and is widely found in a wide variety of electronic devices. Electromagnetic interference includes both conducted interference and radiated interference. Conductive interference refers to coupling signals on one electrical network to another electrical network through a conductive medium. Radiated interference refers to interference sources spatially coupling their signals to another electrical network. Because the nanosecond pulse generator generates high-voltage pulse discharge at the nanosecond pulse front edge, high-frequency conduction interference can be generated on an auxiliary source power supply system, input and output ripples of an auxiliary source direct current DC-DC are affected, and driving signals of a switching tube are further affected to distort output waveforms.
To reduce input/output ripple, eliminate or reduce conducted interference, pi LC low pass filter designs are introduced at the input side of commercial industrial grade DC-DC power modules, as shown in fig. 5, filters are commonly used in power and audio electronics to filter out unwanted frequencies. While there are many different kinds of filters in circuit design based on different applications, their basic ideas are consistent, namely removing unwanted signals.
The pi-type LC low-pass filter belongs to a passive filter, and is an excellent low-pass filter, which is quite different from a conventional LC filter. When pi filters are used for low pass filtering, the output is stable and the K value is fixed. The low pass filter implemented using pi filters is simple. The pi filter circuit is composed of two capacitors connected in parallel and one inductor connected in series. Wherein C is in1 、C in2 For filtering capacitance, L in Is a filter inductance. The pi-type LC low-pass filter can be regarded as a filter capacitor C in1 And L is equal to in C in2 The filter composition, its cut-off frequency is:
the working principle of the pi-type LC low-pass filter is as follows: when there is high frequency positive pulse interference at the input side, as shown in FIG. 6, the current of pi-type LC filter is given to C first in1 Charging with a charging current ofRapidly charge to peak voltage V of pulse cc_peak While inductor L in Also has a linearly increasing current, and is at L in The capacitor C stores more and more magnetic energy along with the increase of current in2 Through inductance L in Also charged with voltage, charging current is +.>C in1 And C in2 The voltages being substantially equal, the load U i Current i in (a) load Is also supplied by the input pulse.
When the input high frequency positive pulse disturbance disappears, as shown in FIG. 7, the load U i Is supplied by three paths, one is C in2 The current provided by the discharge isAnother way is by inductance L in Converting stored magnetic energy into electric energy and combining with C in1 The voltages on the two circuits are connected in series to provide->Load U i The current in (a) is equal to the sum of the discharge currents of the two capacitors, i.e. +.>
To direct current supply V CC In terms of: c in pi-type LC low-pass filter in1 And C in2 Equivalent to open circuit, inductance L in The inductance to the DC component is equal to zero and corresponds to short circuit, so that the DC component can smoothly pass through the inductor L in . For alternating current and high frequency impulse interference: the capacitor has a large capacity, which corresponds to a short circuit, and the inductance has a large inductance to various sine waves, so that the ac component is too small or the number of ac components in the past is small. The pi-type LC low-pass filter can effectively attenuate high-frequency ripple waves on the input side of direct current DC-DC caused by interference, so that the input and output of the direct current DC-DC are more stable, and the influence of the conduction interference on a driving signal of a switching tube is reduced.
The high-voltage nanosecond pulse power supply has the working characteristics of high isolation voltage-withstanding intermittent auxiliary source power supply. For an auxiliary source power supply circuit, a mode of combining an ultrafast recovery isolation diode with an isolation DC-DC is adopted to realize high isolation withstand voltage. At a DC charging voltage of U dc (U dc At most 1000V),each 3 stages of Marx circuit units form a module, and the discharge pulse voltage amplitude of each module is 3U during discharge dc The auxiliary source powered DC-DC power module isolation voltage for each circuit module was 3kV (3U dc Less than or equal to 3000V). The modules are isolated by using an ultrafast recovery diode with the withstand voltage of 5 kV. Diode D when pulse discharge is generated 1 ～D n-1 Reverse cut-off, the reverse voltage born by two ends of each isolation diode is 3U dc 。
For verifying the intermittent auxiliary source power supply method, a 21-level Marx circuit is built, 7 modules are formed in total, and 6 fast recovery diodes are used for isolating the modules. Under the condition that the charging voltage is 800V, the output voltage of each module is 2.4kV, and the output voltage amplitude is 17.4kV. In the experiment, when the charging voltage is 800V, the discharging output pulse amplitude U out And D 1 ～D 6 The voltage amplitude UD across each isolation diode 1 ～UD 6 Output pulse amplitude U capable of stabilizing out The voltage amplitude UD across the isolation diode was 17.4kV 1 ～UD 6 All are 3kV, and are consistent with theoretical analysis values.
The effect of the introduced pi-LC low pass filter on the pulsed power output and auxiliary source power supply system was experimentally measured. Due to the limitation of a measuring tool, the auxiliary source supply voltage value of the highest-level Marx circuit of the 9-level Marx circuit when the amplitude of the output pulse voltage is 6kV is measured by using a differential probe with the measuring range of 7kV in an experiment. First, under no-load conditions, the influence of the presence or absence of a filter on the auxiliary source supply voltage value and the output pulse voltage value of the 9 th stage Marx circuit is measured, respectively.
As can be seen from fig. 8, under the condition of no load and no filter, the voltage value of the auxiliary source power supply system is affected by conduction interference in the stage of the rising edge of the output pulse, high-frequency oscillation is presented to affect the auxiliary source direct current power supply, and low-frequency or single pulse interference exists in the stage of the falling edge of the pulse and the amplitude is larger; from a comparison analysis, it can be seen from fig. 8 that, under no load and with a filter, the auxiliary source supply system voltage value is affected by the conducted interference during the phase of the rising edge of the output pulse, but does not exhibit high frequency oscillation, only exhibits low frequency or single pulse interference, and also during the phase of the falling edge of the pulse. At the same time, with the filter, the ringing of the output pulse voltage is smaller. This means that under no-load conditions, the auxiliary source supply system is less affected by conduction interference when it has a filter, the dc supply voltage is more stable, and the impact on the pulsed power output is less.
The waveforms measured by the experiment under the condition that the load is a resistive load are shown in fig. 9 below. As can be seen from fig. 9, under the condition of load and no filter, the voltage value of the auxiliary source power supply system is still affected by conduction interference in the stage of the rising edge of the output pulse, and still presents high-frequency oscillation to affect the auxiliary source direct current power supply, and low-frequency or single-pulse interference also exists in the stage of the falling edge of the pulse; from a comparison analysis, it can be seen from fig. 9 that under the condition of loading and having a filter, the auxiliary source power supply system voltage value is still affected by conduction interference in the stage of the rising edge of the output pulse, but does not exhibit high-frequency oscillation, but exhibits an envelope waveform of the high-frequency oscillation, and also has interference of low frequency or single pulse in the stage of the falling edge of the pulse, so that the damping oscillation of the output pulse voltage is smaller.
The experiment fully shows that the pi-type LC low-pass filter is introduced into the input test of the auxiliary source power supply system, so that the anti-interference capability of the circuit system can be effectively improved, the auxiliary source power supply system is more stable, the influence of the auxiliary source system on the output pulse power waveform is further reduced, and the output pulse waveform is more similar to square wave pulse.
In order to ensure the stability of the intermittent auxiliary source power supply method of the high-voltage nanosecond power supply under the full power condition, the invention tests the resistance load R L The waveform of the output voltage and current at 2kΩ and 1kHz frequency is shown in fig. 10 below, in which the CH1 channel is tested for the high voltage output pulse voltage U out CH2 is the output pulse current I of the Marx generator pulse . The peak value of the pulse voltage output in the figure is U pulse =21.4kv, pulse voltage amplitude U out =20 kV; the peak value of the output pulse current is 21.4A, and the amplitude I of the current pulse =18.5a; pulse repetition frequency f=1 kHz; pulse width t w =1000 ns; pulse rising edge t r =40ns; pulse falling edge t f As can be seen from the waveforms measured by experiments, the intermittent auxiliary source power supply method designed herein outputs a stable pulse square waveform as the pulse voltage waveform under the full power condition.
The output pulse average power calculation formula P of this experiment is as follows:
wherein: u (U) out -outputting a pulse voltage amplitude;
R L -a load resistance value;
τ -output pulse width;
f-output pulse repetition frequency.
Therefore, the pulse average power P at this time can be calculated according to the formula:
the method can effectively solve the problems of high-floating potential isolation and voltage resistance of the auxiliary source and output waveform distortion caused by conduction interference of the pulse power supply to the auxiliary source power supply circuit during discharging and the like in the conventional solid Marx high-voltage nanosecond pulse power supply. The design thought and principle of the invention and the experimental result situation of the invention after being applied to the nanosecond pulse power supply are described herein, and the above description is only used for helping to understand the method principle and core thought of the invention; also, it is to be understood that the present invention is not limited thereto since modifications may be made by those skilled in the art in light of the present teachings.

Claims (6)

1. The utility model provides an intermittent type formula auxiliary source power supply unit with high isolation withstand voltage-high immunity, includes a plurality of Marx power modules, and every power module has multistage Marx circuit to constitute, and every stage Marx circuit includes MOSFET, its characterized in that: the commercial DC-DC auxiliary source direct current power supply module supplies power for the MOSFET driving circuit, and the Marx power modules are isolated by the ultrafast recovery isolation diode.
2. The intermittent auxiliary source power unit having high isolation withstand voltage-high immunity as recited in claim 1, wherein: the commercial isolation DC-DC module is a Jin Sheng positive power module with isolation voltage of 3kV.
3. The intermittent auxiliary source power unit having high isolation withstand voltage-high immunity as recited in claim 1, wherein: the driving chip of the MOSFET is IXDN609PI manufactured by IXYS corporation.
4. The intermittent auxiliary source power unit having high isolation withstand voltage-high immunity as recited in claim 1, wherein: the input side of the commercial isolation DC-DC module is connected with a pi-type LC low-pass filter, and the pi-type filter circuit is formed by connecting two capacitors in parallel and connecting an inductor in series.
5. The intermittent auxiliary source power unit having high isolation withstand voltage-high immunity as recited in any one of claims 1 to 4, wherein; the working process of Marx circuit charging is as follows: the direct-current charging power supply charges the energy storage capacitor through the diode until the voltage of the energy storage capacitor is equal to the output voltage of the high-voltage direct-current power supply, meanwhile, the direct-current power supply supplies power to the signal receiving circuit and the driving circuit in each stage of Marx circuit unit through the power supply module, and is connected with the energy storage capacitor at the left side of the power supply module in parallel to store energy when the Marx circuit is charged.
6. The intermittent auxiliary source power unit having high isolation withstand voltage-high immunity as recited in any one of claims 1 to 4, wherein; the working process of the Marx circuit during discharging is as follows: when the parallel charging of the energy storage capacitor is completed, the discharge of each stage is controlledThe switch is turned on, the charging switches of each stage are in an off state, the diode is turned off due to reverse bias, the discharging switch connects the energy storage capacitors of each stage in series to discharge the load, and positive pulse of direct current charging voltage is obtained on the load; the ultrafast recovery diode is reversely cut off, and the commercial isolation DC-DC power supply module is not used any moreSupplying power by temporarily supplying energy from the parallel capacitors to make +.>Is suspended at the potential of(n is not less than 2).
CN202310656614.4A 2023-06-05 2023-06-05 Intermittent auxiliary source power supply device with high isolation voltage resistance and high interference resistance Pending CN116827312A (en)

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